Crank-shaft lathe.



I H. P. ARNHOLD 6: A. P. WITTBMAN.

CRANK SHAFT LATHE.

APPLICATION FILED JULY 20, 1910.

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ATTORNEYS v H. P. ARNHOLD & A. P. W IITEMAN.

CRANK SHAFT LATHE.

APPLICATION FILED JULY 20, 1910.

Patented Jan. 16,1912.

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INVENTORS ATTORNEYS WITNESSES H. P. ARNHOLD & A. P. WITTEMAN. CRANK SHAFT LATHE.

APPLICATION FILED JULY 20, 1910.

Patented Jan. 16, 1912.

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WITNESSES ATTORNEYS H. P. ARNHOLD & A. P. WITTEMAN. CRANK SHAFT LATHE.

APPLICATION FILED JULY 20, 1910. 1,015,117.

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WITNESSES M ATTORN EYS Patented Jan. 16,1912.

HENRY P. ARNI-IOLD AND ADAM P. 'WIT'I EMAN, OF PHILADELPHIA, PENNSYLVANIA SAID ARNHOLD ASSIGNOR 'IQ SAID WITTEMAN.

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CRANK-SHAFT LATHE.

Specification of Letters Patent.

Patented m. re, rate.

' Application filed July 20, 1910. Serial No. 572,921

To all whom it may concern Be it known that we, HENRY P. ARNHoLD and ADAM P. WrrrnMAN, both citizens of the United States, residents of the city and county of Philadelphia, State of Pennsylvania, have invented a new and useful Crank-Shaft Lathe, of'which the following is a specification.

Ourinvention consists of an improved lathe for turning crank-shafts or similar eccentric machine elements.

It further consists of an improved head for such a machine in which crank-pins may be centered to be turned regardless of the angles at which the cranks project in' relation to each other.

It further consists of an improved faceplate inwhich a crank-shaft may be supported to center crank-pins of different throws and at different relative angles.

It further consists of improved means for counterbalancing a crank-shaftin a faceplate so as to balance such plate in its rotation.

It further consists of other novel features ofconstruction, all as will be hereinafter fully set forth.

For the purpose of illustrating our invention we have shown in the accompanying drawings one form thereof which is at present preferred by us, since the same has been found in practice to give satisfactory and reliable results, although it is to be understood that the various instrumentalities of which our invention consists can be variously arranged and organized and that our invention is not limited to the precise arrangement and organization of these instrumentalities as herein shown and de-. scribed.

' Figure 1 represents a top plan view of ,our improved crank-shaft lathe. Fig. 2 represents an axial vertical section of the lathe.v

Fig. 3 represents a face view of one of the face-plates and its chuck and means for adjusting it. Fig. 4 represents the stripped face-plate. Fig. 5 represents a view of adisk upon the face-plate. Fig. 6 represents an enlarged view of the chuck upon the faceplate and its adjusting disk. Fig. 7 represents a view of the outer face of the faceplate and its gearing. Fig. 8 represents apartly broken view of said face-plate. Fig. 9 represents a face-view of the rotating head for supporting the cranks. Fig. 10 represents' an'edge-view of said head. Fig. 11 represents a sectional detail view taken on the .line a4r in Fig. 9, Fig. 12 represents a diagrammatic view of one of the faceplates, illustrating the position of a crank before centering. Fig. 13 representsa similar view illustrating the position of the centered crank. Fig. 1-1 represents a some- .what diagrammatic side view ofthe two upon the shaft 2 to revolvethe same. A

stationary face-plate, 10, has a short shaft, 11, journaled in a bearing, ard, 13, upon the bed, and a similar movable face-plate, 14, has its shaft, 15, journaled in a bearing,16,upon a standard, 17, mounted to slide longitudinally upon ways or shears, 18, on the bed. A pinion, 19, having a shaft, 20, formed with a polygonal end, 21, for a crank or handle to turn it, has said shaft journaled in an overhang, 22, of the foot of the standard for the movable face-plate, and meshes with a rack, 23, upon the bed, so that 12, upon a standthe face-plate may be longitudinally moved upon the bed-plate. The two face-plates have cogged rims, 24, and have guards, 25, secured to their standards and covering the cogged rims. Said cogged rims mesh with pinions, 26 and 27, upon the-main shaft 2 to be rotated in unison from the same, and the pinion 26 which meshes with the cogs of the movable face-plate has a spline, 27, which slides in a-longitudinal groove, 28, in the shaft, so that the pinion may slide upon and revolve with the shaft. The pinion has'a hub-sleeve, 29, which is journaled in a depending bearing, 30, upon the base of the standard, so that the pinion will move longitudinally with the standard and th face-plate,

Each face-plate has a circular T-groove' or otherwise undercut groove, 31, upon its inner face, and having its center eccentric to the center of the plate, and the heads, 32, of screw-bolts, 33, fit and slide .in said groove. A circular disk, 34, is secured over said groove and to the face of the face-plate by having the screw-bolts passed through holes in the disk and having nuts, 35, upon the bolts and bearing against the face of. the disk, so that the disk may be rotated and adjusted upon the face-plate. A circular T-groove or otherwise undercut groove, 36, is formed in the face of the disk and has its center eccentric to that of the disk, and the heads, 37, of screw-bolts, 38, fit and slide in said groove. A circular disk or footflange, 39, is secured to the face of the disk 34 by the bolts passing through holes in such-foot-flange and having nuts, 40, for

clamping the same, so that said flange may be rotated and adjusted. The periphery of the foot-flange has a number of notches, 41, dividing said periphery in such subdivisions of the circle as will correspond to the angles at which the cranks are usually relatively set in crank-shafts having two, three, four, five and six cranks, and said notches are en'aged by a spring-bolt, 42, upon the face of the disk. It is evident that the foot-flange may have notches at points registering with the angles of one particular form of crank-shaft, only. A

clamp, 43, is provided upon the foot-flange and has a shank, 44, projecting from the face of the flange 'andformed with a rigid jaw, 45, parallel with the face of the footflange. The clamping notch or recess, 46, of this jaw is concentrlc with the foot-flange. At one end of the clamping edge of the rigid jaw are formed two cars, 47, between which the reduced end of a movable jaw, 48 is pivoted u on a pin, 49. The outer end of the mova le jaw has an open-ended slot, 50, which is engaged by a latch, 51,

pivoted in a registering slot, 52, in the rigid jaw, and said latchhas a screw-stud, 53, at its free end, carrying a nut, 54, by means of which the latch may be clamped in the slot of the movable jaw. The clamping notch or recess, 55, of the movable jaw registers with that of the ri id jaw and'is concentric with the footange. Each faceplate has a concentric, circular T-groove or otherwise undercut groove, 56, in its outer face, and the heads, 57, of screw bolts, 58, fit and slide in said groove. Semi-circularly curved weights, 59, have each two parallel slots, 60, through which the bolts pass, and such weights may be adjusted nearer to or farther from the center of the face-plate by moving them in or out upon the bolts in said slots and adjusting them by means of nuts, 61. By adjusting the bolts in the circular groove, theweights may be placed so as to be diametrically opposite and to counterbalance the predominating weight of one or more unbalanced cranks and the and the crank-pin to be turned is concentric with the face-plates and with the axial line of the same.

An annular head, 62, has rotary bearing in an annular upright frame, 63, the base,

64, of which is supported to slide longitudinally upon the ways or shears 18 of the lathe-bed. Said base has an over-hang,-65, in which is journaled a short shaft, 66, having a polygonal outer end for applying a crank or handle for turning it, and a pinion, 67, at its inner end, meshing with the rack 23 upon the bed. The outer periphery of the annular head has a cogged rim, 67*, and a pinion, 68, having a hub-sleeve, 69, meshes with said rim. The hub-sleeve is journaled in a bearing, 70, depending from the base of the annular frame, and said' sleeve and pinion has a spline, 71, engaging the shaft, so that the pinion turns with and slides upon the shaft, together with the upright annular frame or head-support.

The annular head has "an annular T- groove or otherwise undercut groove, 72, in the face opposite the movable face-plate, and two sector-shaped jaw-supports, 73, and an end-jaw support, 74, have headed screwbolts, 75, inserted through holes in the same, and the heads of said bolts engage and slide in said' groove and have nuts, 76, which clamp said supports or holders upon the head. The supports have radial grooves, 77, which are engaged by tongues, 78, upon the inner sides of two cheek-clamping jaws, 79, and an end clamping jaw, 80, so that said jaws may move radially.- Said jaws are formed with longitudinal slots, 81, parallel with the tongues, and bolts, 82, projecting from the supports, and through the slots, have nuts, 83, by. means of which the jaws may be secured in their'radially adjusted positions. The check-clamping jaws have internally screwthreaded ears, 84, en-

gaged by adjusting screws, 85, which are' journaled in ears, 86, upon the supports, and the jaws are radially adjusted to clamp the checks of a crank by said screws and are to have their centers in one axial line and their cog and pinion connection to the'main shaft is such that they revolvem unlson.

' When a crank-shaft is to be turned in-the are arranged 'to be in axial alinement. The

' crank, the pinof which is to. be turned, is

now adjusted so as to'bring said pin in the axial line of the face-plates and head. This -is accomplished by the eccentric arrangement of the chucks upon the face-plates, as

illustrated in Figs. 12 and 13 of'the drawing s. The machine is adapted to turn the pins of cranks of difierent lengths of throw and standing at different angles to each other. After the shaft has been clamped in the chucks of the face-plates, the crank pin may, for instance, be considerably out of center and radially removed from the center, as shown in Fig. 12. The eccentrically pivoted disks on the face-plates are first loosend and thereupon rotated to bring the centers of the foot-flanges and chucks at a distance from the axial line of the plates and head equal to the throw of the crank, whereupon the chuc and their foot-flanges are rotated to bring, the crank-pin into such axial line, when the spring-bolts will lock such chucks and flanges in position and the clamping nuts be tightened on their bolts.

The jaws and .their supports are now adjusted in the annular groove of the head, and the clamping bolts tightened, and the clamping jaws are adjusted by their screws and secured by their clamping bolts, as is also the end-jaw, so as to hold one cheek of the crank in thehe'ad with theclamping jaws against its edges and the end-jaw against the end of the cheek, and with the pin cen tered, as seen in Fig. 13,in which figure and in Fig. 12, the jaws are indicated in dotted lines. Fig. 9 also illustrates the crank clamped,the shaft in the drawings being indicated'by the numeral 86, the cheek by 87, and the crank pin by 88. After the disk has been adjusted to the throw of the cranks, other cranks at varying angles to each other may be centered by rotating the foot-flanges and chucks to bring thecenters of the pins concentric with the head, and the notches and spring-bolts secure the chucks in their adjusted positions. The adjustable counterweights upon the face-plates are adjusted to counterbalance the shaft and cranks eccentric to the head and face-plates by ad justing them diametrically opposite the greatest eccentric load of such shaft and cranks, and the counterbalance may be increased and decreased by adding and removing weights and by adjusting them farther from and nearer to the centers of the face-plates, so that perfect balance and,

consequently, perfect centering -may be at-- tained in turning the crank-pins.

By having the counterweights upon the sides of the face-plates opposite the sides having such weights circularly adjustable entirely around the faces of the face-plates, perfect counterbalancing of. the shaft in the lathe is attainable, no matter how irreguhaving the adjustable clamping means, and 3 lar the disposition of the cranks may be in their relative projection" from the shaft and no matter how counter-weights, eccentrics or other bodies, not cranks, may be disposed upon a shaft.

By providing radial and circular adjustment for the shaft and crank-cheek clamping means in the face-plates and heads and by constructing the lathe with one of said face-plates and the head having the cheekclamps longitudinally and independently movable, the pins of crank-shafts of difi'erent lengths, having cranks of different throws and standing at difi'erent angles to each other, may be turned on the one lathe, and the crank, the pin of which is being turned, will be steadily supported, so as to be turned absolutely even and true.

We 7 are aware that face-plates for lathes have been constructed with a disk pivoted eccentrically upon one face of the plate and having the disk or foot-flange of a shaft-chuck eccentrically pivoted upon its face, and we are also aware that counterweights upon face-plates or lathe-heads are not broadly new, but the lathe herein illustrated and described embodies such devices in a manner not'heretofore embodied in one so i machine, and thus our machine accomplishes novel and useful results not heretofore attained in a shaft-turning lathe.

It will now be apparent that we have devised a novel anduseful' construction of a crank shaft lathe which embodies the features of advantage enumerated as desirable in the statement of the invention and the above description, and While we have, in the present instance, shown and described a preferred embodiment thereof which has been found in practice to give satisfactory and reliable results, it is to be understood that the same is susceptible of modification in various particulars without departing from the spirit or scope of the invention or sacrificing any of its advantages.

Having thus described our invention, what we claim as new and desire to secure by Letters Patent, is:

1. In apparatus of the character stated, a

its

rotating face-plate having on one face circularly and radially adjustable means for eccentrically supporting a crank -,shaft to have a crank-pin concentricwith it, and a circularly and radially adjustable counterweight on the opposite face of said face plate, such circular adjustment extending entirely around the face of the face-plate.

2. In apparatus of the character stated,

. radially adjustable means on one face for headed bolts having their heads engaging and a rotating face-plate having circularly and eccentrically supporting a crank-shaft to have a crank-pin concentric with it and having an annular undercut groove in its opposite face extending entirely around and concentric with the same, a weight having slots parallel with each other and with a radius of the face-plate, and bolts having their heads engaging and sliding in the annular groove and projecting through the slots and having nuts clamping the weight against the face of the face-plate. I

3. In apparatus of the character stated, an annular rotating head, and cheek-clamping jaws circularly and radially adjustable upon the face of and in their relation to the center of the same.

4. In apparatus of the character stated, an annular rotating head, jaw supports secured to becircularly adjustable upon one face of said head, and cheek-clamping jaws secured to be radially adjustable upon said supports.

5. In apparatus of the character stated, an annular rotating head formed with an annular undercut groove in one face, supports having radial grooves in their outer faces, headed bolts having their heads engaging and sliding in said annular groove and passed through holes in the supports and provided with nuts clamping said supports, cheek-supporting jaws having tongues en'- gaging and sliding in the grooves in the supports and formed with parallel slots, and bolts in the supports and passing through the slots and having clamping nuts securing said jaws.

6. In'apparatus of the character stated, an annular rotating head formed with an an nul'ar undercut groove in one face, supports having radial grooves in their outer faces,

sliding in said annular groove and passed through holes in the supports and provided with nuts clamping said supports, cheeksupporting jaws having tongues engaging a and. sliding in the grooves in the supports and formed with arallel slots, bolts inthe supports and passing through the slots and having clamplng nuts securing said jaws, and-adjusting screws rotatably supported in two diametrically opposed supports and having threaded engagement with the jaws thereon.

7. In apparatus of the character stated, a bed, an annular head supported to be longitudinally moved and adjusted upon said bed and provided with circularly and radially adjust-able cheek-clamping jaws on one face, two face-plates at op osite sides of thehead and having each a dlsk upon its face rotatably adjustable on a center eccentric to the plate and a chuck rotatably adjustable on a center eccentric ,to thatof the disk, means for rotating the head and face-plates in unison, and means for longitudinally and independently moving and adjusting the head and one of the-face plates upon thebed.

8. In apparatus of the character stated, a bed, an annular head supported to be longitudinally moved and adjusted upon said bed and provided with circularly and radially adjustable cheek-clamping jaws on one face, two face-plates at opposite sides of the head and having each a disk upon its face rotatably adjustable on a center-eccentric to the plate and a chuck rotatabl adjustable on-a center eccent-ric to that o the disk, means for rotating the head and face-plates in unison, counterweights supported circularly 80 and radially adjustable upon the face-plates, and means for longitudinally and independently moving and adjusting the head and one of the face-plates upon the bed.

HENRY P. ARNHOLD. ADAM P. WITTEMAN.

Witnesses:

WM. SEoHER, E. HAYWARD FAIRBANKS, 

